Rotary water-meter.



PATENTBD SEPT.'1I5, 1903.

I No. 788,836.

El L. NORTHROP. ROTARY WATER METER.

APPLICATION FILED MAY 2. 1903.-

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UNITED STATES Patented September 15, 1903.

PATENT Crricnt FRANK L. NORTHROP, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO UNION WATER METER COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATON OF MASSACHUSETTS.

ROTARY WATER-M ETER.

JIPE'JIFICATION forming part of Letters Patent No. 738,836, dated September 15, 1903.

Application filed May 2, 1903- Serial No- 155J244I model-l To a. whom it may concern:

3e it known that I, FRANK L. NORTHROP,.

a citizen of the United States, residing at 'Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Improvement in Rotary \Vater- Meters, of which the following, together with the accompanying drawings, is a specification sufficiently full, clear, and exact to enable persons skilled in the art to which this invention appertains to make and use the same.

This invention relates to that class of watermeters in which two coacting rotary pistons or oppositely disposed segmentally armed cylinders are employed, mounted to revolve upon upright axis-posts fixed within a twin cylindrie casing, which is provided with inlet and outlet ways for the water or fluid. An example of the previous construction of a meter of this class may be found in Letters Patent Nos. 207,862 and 386,795.

The objects of my invention are, first, to obviate the unequal and irregular side wear upon the axis-posts heretofore experienced in the working of this class of meters; second, to obviate a tendency of the outgoing water to create a reverse force against the regular motion of the pistons; third, to afford means for resisting the eifect of the water-hammer and to prevent breakage of the pistons by the shocks thereby produced; fourth, to avoid confinement of air in the upper part of the piston-chamber, and, fifth, to impart to the flow of water a direction that will render the running of the pistons lighter and easier, thus making the meter more sensitive. These objects I attain by the means set forth in the following detailed description, defined in the claims, and illustrated in the accompanying drawings, wherein- Figure 1 represents a vertical section of the body parts of a rotary water-meter embodying my invention, taken on line X X. Fig. 2 represents a horizontal section of the same at line W TV on Fig. 1; and Fig. 3 is a vertical section at line Y Y on Fig. 2, drawn to smaller scale, showing the meter-casing with the pistons removed and looking toward the outlet port.

Referring to the drawings, A denotes the eylindric piston-chamber walls and disposed in intermediate relation to the two pistons and extending across the outletspace a from the bottom of the chamber nearly to its top, but affording a long horizontal main exitport 6 near the top of said chamber, with the outlet-space extending down at the back of said barrier from theport to the outlet-way ct, as best shown in Fig. 1. At the bottom of the piston-chamber a small opening or minor port d is provided beneath the barrier D to permit back drainage or escape of water from the meter-chamber when the service is shut off; but said opening is made of such small dimension that it carries no material portion of the outflow in the running of the meter. The barrier D may be formed integral with the casingcasting or it may be separately formed and firmly affixed in position therein.

F indicates an upright \l-shaped deflector fixed to the bottom of the casing at the inletway a and proj eetin g upward within the chamber with spaces 5 at either side for directing the entering fluid right and left toward the segment-headed arms of the respective pistons. Said deflector is also adapted for giving to the inflowing current a somewhat upward deflection.

K indicates the piston-connecting gear, and M the register-operating gear; but these parts, together with the register mechanism, are not of my invention and may be of any well-known kinds, and need not be further shown or described.

In the operation of the meter the barrierD interrupts the currents that flow around the revolving pistons and causes the waterto take an upward tendency before passing out of the the piston.

to run with greater ease and sensitiveness.

The outlet being at the top of the barrier any air within the chamber is at once driven off with the outgoing liquid. Another great advantage of the barrier is that it acts as a firm reaction-guard at its position across the outlet-space and protects the pistons from the reactive effectand shocks of water-hammer when the flow is abruptly checked, and thus prevents breakage of the pistons, as sometimes occurs, frequently in situations Where meters are connected in a direct line of piping and are run under high pressures.

What I claim as of my invention, and de sire to secure by Letters Patent, is

1. In a water-meter comprising two intermatchi-ngrotary pistons; a transverse barrierpartition within the meter-casing, arranged across the outlet-way approximately tangent to the twin cylindric circles of the pistonchamber, and having the exit-port disposed in intermediate relation to the two pistons above said barrier at the upper part of the piston-chan1ber, for the purpose set forth.

2. The combination, with the two rotary pistons,the meter-casinghavinginlet and outlet passages, and the piston-axis post fixed in the bottom of said casing, of the barrier-plate disposed in intermediate relation to the pistons between the piston-chamber and main outlet formed asanelongatedhorizontal space, with the outlet-port along the top of said barrier, substantially as set forth.

3. In a meter of the character specified, the combination, with the two rotary intermatohing pistons, stationary axis-posts upon which said pistons are mounted,and the meter-chamber casing having an inlet-way provided with a deflector for inducing lateral and upward inflection of the inflow-current; of a barrier or partition at the outlet side of the meterchamber, a long exit-port at the top edge of said barrier and a minor drainage-port beneath said barrier.

Witness my hand this 29th day of April,

FRANK L. NORTHROP. Witnesses:

CHAS. H. BURLEIGH, EDW. P. KING. 

